Gday Prof
I would suggest the Kellys Heroes Japanese....but other than my store I do not know of ANYONE outside of the UK that sell them, and as I am based in Australia that does not fit your requirements.
Also look at Britannia Japanese figures. Again they are a UK company, I stock them as well, but I am certain that they will be available from a retailer in the States.
Peter
BattleScape Military Books & Miniatures